Process of hardening and welding copper.



STATES CHARLES BITTNER, OFSTA'FFORD, KANSAS.

PROCESS OF HARDENING AND WELDING C(lPIPER.

1,122,052. No Drawing.

To all whom it may concern Be it known that I, CHARLEs BrrrN'En a ing is a specification.

; My invention relates to a process of hardening and welding copper, the object of the invention being to provide a simple, reliable and efficient process, and compound employed therein, whereby copper may be quickly hardened to a material degree or rapidly Welded while being hardened to make. a strong joint.

In carrying my invention into practice,

I employ a composition of acidified hyposulfite of soda, in crystal or granulated form or reduced to a powder. The said composition consists substantially of the following ingredients: Hyposulfite of soda, 16 ounces; sulfite of soda, 1/2 ounce; acetic acid No. 8

(containing 25% pure acid), 3 ounces; and

powdered alum l.ounce. These ingredients are thoroughly combined together in any suitable manner, and then reduced to a powder for use. I 4

In employing the hardening compound. the piece of copper to be treated. is heated in a forge or 'suitable flame to a good cherry heat. A littie of the powder is then dusted on one side of the copper and allowed to fuse and burn off. The copper is then turned to present a fresh surface, on which a little of the powder is dusted in a similar manner and burnt off, and this operation is repeated,the copper being: turned and the powder applied to the surfaces thereof, until the entire surface of the body of copper has been treated. In each instance the dust ed surface is allowed to heat for a period of about thirty seconds, care being taken -in order to prevent the use of too much of'the compound at this stage, as it will tend to eat unduly into the copper. The copper is thep, in a. second stage of treatment, again treated in asimilar manner, but-at a low degree of heat or over a low fire, the compound being applied to the surface thereof and allowed to burn 03 until the entire sur face of the copper is a second time treated. The copper at this'stage is soft enough to be hammered or welded, and is then ham- Specification of Letters Patent. I PatnteddDgc, 232, 1914,

Application filed June a, 1914. Serial No. 843,514.

hardened for cutting purposes, without temporing treatment of any kind. The acidified hyposulfite of soda in this composition acts mainl as the hardening agent, butits action is promoted by the addition of the sulfite of soda and alum. Under some conditions the sulfite of soda and alum may be omitted, but their use is preferred, for the reason that more efficient resultsare obtained.

Iclaim 1. The herein described process of hard-- ening copper, which consists in heating the copper to a cherry red, and'then successivelyv subjecting portions thereof to the action of acidified hyposulfite of soda, until the whole of the surface, of the copper is treated.

2. The herein described process-of hardenlng copper, whlch consists in first heating copper to a cherry red, successively treating portions of the heated. copper at the cherry red temperature to the action of acidified hyposulfite of soda,-and then repeating the above described treatment while the copper is heated at a lower temperature 3. The herein described process of hardening copper, which consists in heating the copper to a cherry red, and then successively subjecting portions thereof to the action of hyposu'lfite ofsoda, acetic acid and alum, until the whole of the surface of the copper is treated.

4. The herein described process of hard cning copper, which consists in heating the copper to a'cherry red, successively treating portions of the heated copper'at the cherry red temperature to the action of a compound of hyposulfite of soda, acetic acid and alum, and then repeating the above described treatment while the copper is heated at a lower temperature.

In testimony whereof I affix my signature in presence of two witnesses.

. CHARLES 'BITTNER.

Wi nesses:

JOHN A. Brrrnnn, F. B. HULL. 

